Chapter 14413Q14.20The excess pressure is transmitted undiminished throughout the container. It will compress airinside the wood. The water driven into the wood raises its average density and makes if float lowerin the water. Add some thumbtacks to reach neutral buoyancy and you can make the wood sink orrise at will by subtly squeezing a large clear–plastic soft–drink bottle. Bored with graph paper andproving his own existence, René Descartes invented this toy or trick.Q14.21The plate must be horizontal. Since the pressure of a fluid increases with increasing depth, otherorientations of the plate will give a non-uniform pressure on the flat faces.Q14.22The air in your lungs, the blood in your arteries and veins, and the protoplasm in each cell exertnearly the same pressure, so that the wall of your chest can be in equilibrium.Q14.23Use a balance to determine its mass. Then partially fill a graduated cylinder with water. Immerse therock in the water and determine the volume of water displaced. Divide the mass by the volume and
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